<Columns>
    <Column>
        <Cascader style="width:400px;" Data="data1"  Clearable IsIsolated>
        </Cascader>

    </Column>
    <Column>
        <Cascader style="width:400px;" Data="data2" Clearable IsIsolated IsMultiple>
        </Cascader>
    </Column>

</Columns>

@code{
    
    //下面为了方便，直接从json文件加载数据
    static string dataFile = "Pages/data/data1.json";
    List<CascaderItem<string>> data1 = Cascader<string>.BuildDataFromJson(System.IO.File.ReadAllText(dataFile));
    List<CascaderItem<string>> data2 = Cascader<string>.BuildDataFromJson(System.IO.File.ReadAllText(dataFile));
}